2 day period?! Help?!

Cassie
Advise please! 
So usually I have a 28 day cycle, last month it was irregular and went to 34 days. ( very out of character for my body ) Thought I was preg but all tests came back negative including blood test. I ended up getting my period the next day. I have had uncomfortable cramping and have now only had two days of my period ( hardly anything there this morning day 3 ) I usually have a 5 day period. 
My question is ; what the heck  is going on with my body?! Should I be worried that my "period" has only lasted two days? Could it be something more serious? Has anyone had anything like this before? Should I go to the docs? 
Advise / suggestions would be more than appreciated!!